Isuzu N-Series. Manual — part 344
6A3-28 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
6. A/C Compressor (If equipped with A/C)
1) Tighten fixing bolts to the specified torque.
Tighten:
A/C compressor bolt to 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
Notice:
When tightening the compressor fixing bolts, tighten first
the 2 bolts on the rear side, and then the remaining 2 on
the front.
2) Install drive belt adjust belt tension by adjusting
bolt and tighten locking nut to the specified
torque.
3) Depress the drive belt mid-portion with a 98 N
(10 kg/22 Ib) force.
Tighten:
Locking nut to 27 N
⋅m (2.8 kg⋅m/20 lb⋅ft)
• Connect the negative battery cable.
• Lower the cab.
• Start engine and check for gas leakage carefully.
Drive Belt Deflection
mm (in)
16 — 20 (0.63 — 0.79) ... New belt
18 — 22 (0.71 — 0.87) ... Reuse belt
N6A0416E
N6A0417E
Legend
1. Belt deflection
N6A0418E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-29
TIMING GEAR REPLACEMENT
Component
N6A1633E
6A3-30 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Removal
Preparation
• Disconnect battery ground cable.
• Tilt the cab.
• Drain coolant and engine oil.
1. Engine Assembly
Above works refer to “ENGINE ASSEMBLY” sec-
tion in this manual.
2. Nozzle Cover
3. Cylinder Head Cover
4. Head Cover Gasket
5. Rocker Arm Shaft Assembly
1) Loosen the rocker arm shaft bracket nuts and
bolts in numerical order a little at a time and re-
move the rocker arm shaft assembly with the
camshaft brackets.
2) Leave the (1) indicated bolt unremoved on this
occasion, since it is the rocker arm fixing bolt.
Caution:
Failure to loosen the rocker arm shaft bracket nuts and
bolts in numerical order a little at a time will adversely af-
fect the rocker arm shaft.
6. Valve Cap
Caution:
Take sufficient care not to let valve caps fall into the gear
case or oil return hole.
7. Camshaft Bearing Cap
8. Camshaft Bearing Upper
9. Camshaft Assembly
10. Camshaft Bearing Lower
If the camshaft bearings are to be reinstalled, mark
their fitting positions by tagging each bearing with
the cylinder number from which it was removed.
Legend
1. Engine assembly
16. Engine control lever assembly
2. Nozzle cover
17. Oil pipe
3. Cylinder head cover
18. Injection pump assembly
4. Head cover gasket
19. Flywheel
5. Rocker arm shaft assembly
20. Rear oil seal
6. Valve cap
21. Slinger
7. Camshaft bearing cap
22. Spacer rubber
8. Camshaft bearing upper
23. Oil pan
9. Camshaft assembly
24. Power steering pump idle gear cover
10. Camshaft bearing lower
25. Power steering pump idle gear
11. Cylinder head assembly
26. Flywheel housing
12. Cylinder head gasket
27. Idle gear A
13. Clutch pressure plate assembly
28. Idle gear B
14. Driven plate
29. Idle gear B shaft
15. Engine control wire
N6A0420E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-31
11. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
12. Cylinder Head Gasket
Caution:
Do not reuse the cylinder head gasket.
13. Clutch Pressure Plate Assembly
1) Insert the clutch pilot aligner to the clutch as-
sembly.
Clutch Pilot Aligner: 5-8840-2240-0
2) Loosen the pressure plate bolts in numerical
order a little at a time as shown in the illustra-
tion.
3) Remove the pressure plate assembly.
14. Driven Plate
Remove the driven plate with the clutch pilot align-
er.
15. Engine Control Wire
16. Engine Control Lever Assembly
Legend
1. Camshaft bearing cap
2. Camshaft bearing upper
3. Camshaft assembly
4. Camshaft bearing lower
N6A0421E
N6A0422E
Legend
A. Knock pin
Legend
1. Clutch pilot aligner
2. Clutch pressure plate assembly
3. Driven plate
N6A0352E
N6A0351E
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